Speaker



FIG. 1 is a front view of a speaker showing my new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a perspective view of the front, right side and top plan thereof; and,

FIG. 8 is a perspective view thereof with a stand.

The broken line is for the illustrative purpose only and forms no part of the claimed design. 

The ornamental design for a speaker, as shown and described. 